Marching Forward with Confidence by Hu Xianfeng/Zhou Lingzhen

Hu Xianfeng, a Chinese person residing in Spain, runs a grocery store there; regarding faith, he began to know Jesus from a young age through his grandmother's witness filled with love and confidence; although he has experienced doubts and difficulties, he has always believed that God is faithful and just, guiding him to turn back during the low points of his life; another sister, Zhou Lingzhen, has also profoundly experienced God's peace and grace through her faith; how did their experiences in Spain mark an important step forward in their faith?